condition mean min max ZT0-3 15.2620370625 14.97344335 15.550630775 ZT4-7 9.512928787500002 9.2020950445 9.823762530500002 ZT8-11 10.84122918425 10.215202753500002 11.467255615 ZT12-15 22.448543975 17.163323265000002 27.733764685 ZT16-19 23.6830715025 23.62893295 23.737210055 ZT20-23 19.52679896 17.7474229 21.30617502